Happening of an event

If the of happening of a event is 0.42 then the probability of non- happening of that event is 0.58

What is the sum of the probabilities of happeing of an event & not happening of the event ?

In two independent events the probability of happening one event is 2/7 and probability of happening of second event is 1/5 . Find the probability of happening of both events.

If the probability of occurrence of an event is p then the probability of non-happening of this event is

The probability of happening of two events A and B is 0.25 and 0.50 respectively and the probability of happening of both events A and B is 0.14. Find the probability that none of the event happens.

The probability of happening an event A in one trial is 0.4. Find the probability that the event A happens at least one in three independent trials.

The probabilities of happening of two events A and B are 0.2 and 0.0 respectively. If the probability of happening of A and B together is 0.14, then probability that neither A nor B happen is a. 0.39 b. 0.2 c. 0.11 d. none of these

Match Column I (Event) with Column II (order of the time interval for happening of the event) and select the correct combination from the options given below. {:("Column I","Column II"),("(i) Rotation period of Earth",(p) 10^(5)s),("(ii) Revolution period of Earth",(q) 10^(7)s),("(iii) Period of a light wave",(r) 10^(-15)s),("(iv) Period of a sound wave",(s) 10^(-3)s):}

Let P(A_i), the probability of happening of independent events A_i(i=1, 2, 3) " be given by " P(A_i)=1/(i+1) Statement-1 : The probability that at least one event happens is 3/4 . . Statement-2 : P(uuu_(i=1)^(3)Ai)=1-prod_(i=1)^(3)P(A'_(i))